Rep. John Dingell leaned back in his plush office chair and considered the feed that scrolled over his flat-screen TV at 10:07 a.m. Thursday. The Supreme Court, it said, had upheld the health care law he had worked for his entire life — and his father for nearly a quarter-century before that. And Chief Justice John Roberts, appointed by Republican President George W. Bush, had sided with the court’s liberals on the crucial point.